142 research outputs found
Nonlinear conductance of nanowires - A signature of Luttinger liquid effects?
We analyze recent measurements of the room temperature current-voltage
characteristics of gold nanowires, whose zero current conductance is quantized
in units of . A faster than linear increase of current with voltage was
observed at low voltages beginning from V. We analyze the nonlinear
behavior in terms of a dynamic Coulomb blockade of conducting modes and show
that it may be explained as a Luttinger-liquid effect.Comment: 13 pages, latex with supplied stylefile, 3 figures in eps format,
submitted to Superlattices and Microstructure
Influence of the Rashba effect on the Josephson current through a superconductor/Luttinger liquid/superconductor tunnel junction
The Josephson current through a 1D quantum wire with Rashba spin-orbit and
electron-electron interactions is calculated. We show that the interplay of
Rashba and Zeeman interactions gives rise to a supercurrent through the 1D
conductor that is anomalous in the sense that it persists in the absence of any
phase difference between the two superconducting leads to which it is attached.
The electron dispersion asymmetry induced by the Rashba interaction in a
Luttinger-liquid wire plays a significant role for poorly transmitting
junctions. It is shown that for a weak or moderate electron-electron
interaction the spectrum of plasmonic modes confined to the normal part of the
junction becomes quasi-random in the presence of dispersion asymmetry.Comment: 25 pages, 3 figure
Nanoelectromechanics of shuttle devices
A single-electron tunneling (SET) device with a nanoscale central island that
can move with respect to the bulk source- and drain electrodes allows for a
nanoelectromechanical (NEM) coupling between the electrical current through the
device and mechanical vibrations of the island. Although an electromechanical
"shuttle" instability and the associated phenomenon of single-electron
shuttling were predicted more than 15 years ago, both theoretical and
experimental studies of NEM-SET structures are still carried out. New
functionalities based on quantum coherence, Coulomb correlations and coherent
electron-spin dynamics are of particular current interest. In this article we
present a short review of recent activities in this area.Comment: 23 pages, 26 figure
Persistent current in a one-dimensional ring of fractionally charged "exclusons''
The Aharonov-Bohm effect in a one-dimensional (1D) ring containing a gas of
fractionally charged excitations is considered. It is shown that the low
temperature behavior of the system is identical to that of free electrons with
(integer) charge . This is a direct consequence of the fact that the total
charge in the ring is quantized in units of the electron charge. Anomalous
oscillations of the persistent current amplitude with temperature are predicted
to occur as a direct manifistation of the fractional nature of the
quasiparticle charge. A 1D conducting ring with gate induced periodical
potential is discussed as a possible set-up for an experimental observation of
the predicted phenomenon.Comment: 4 pages, RevTex, uuencoded figure
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